Deep Leviathan
You see an enormous shape move beneath you in the darkness. Its form glides through the water before it slowly but surely rises up in front of you. Numerous tentacles writhe before you as two large luminous orbs open up and stare at you with an unknown intelligence. And soon trails of spots begin to glow along the immense length of this creature, showing you just how small you are. You feel a deep rumbling go through your being as it just now seems to... wait.
I had the initial sketch for this drawn up a long time ago. But I finally decided to finish it finally.
I think this might be a variant of a leviathan or kraken for my D&D world and I honestly really like how it looks. Some things don't quite make sense for what a cephalopod normally works. But, eh, fantasy! XD